A developer specializes in using the framework, an open-source software development kit, to create games, apps, and other interactive programs primarily for mobile platforms. They write code, often in languages like Python, C++, or JavaScript, to design game mechanics, graphics, and sound effects. They also troubleshoot and resolve any issues or bugs that arise during development. Additionally, a developer collaborates with other team members, such as graphic designers and testers, to ensure the game or app provides an engaging and seamless user experience. They continuously update their skills to stay current with evolving technologies.